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Effects of AIA Quick Guide to UL 489 or UL 1077
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"Effects of AIA Quick Guide to UL 489 or UL 1077"
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The function of a circuit breaker is to provide overload (thermal) and short-circuit (magnetic) protection to a circuit and its downstream components. A circuit breaker functions like an airbag in a car, protecting circuit components and people by tripping the circuit to interrupt the current flow if it detects a fault condition in the control system.

Without circuit breakers, motors and other equipment would be susceptible to damage due to short circuits, resulting in costly repair or replacement of components, as well as frustrating downtime. 

A few common questions that come up with OEM machine builders and control panel builders are “How do I know when to use UL 1077 or UL 489 breakers in panels or equipment?” and “How do you assure that you meet the required standards?” 

In this white paper you will learn: 

  • The difference between UL 489 and UL 1077 circuit breakers and where they should be deployed.
  • What standards must be met for a breaker to qualify as a UL 489 or UL 1077 breaker
  • How UL 489 and UL 1077 breakers can be used in concert to protect critical electrical equipment.


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